Submarine canyons occur at the edge of the continental shelf and cut across the slope and rise along the U.S. east coast. Three of these canyons (Oceanographer, Lydonia, and Gilbert) are situated south of Georges Bank. Gravity cores and grab samples were collected as part of a study of the active processes and sediment distributions within these features. The results of the textural
analyses are contained in this data layer.

Purpose:

The purpose of this data layer is to provide a digital version of the sediment data published in Schwartz (1965).

Navigation was by Loran A. Inasmuch as the shore locations were not reported and the accuracy of Loran A is dependent on the distance from the stations, accuracy of the navigation is unknown.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: James Schwartz

Publication_Date: 1965

Title:

The geology of Oceanographer, Gilbert, and Lydonia submarine canyons south of Georges Bank, off the northeastern U.S.

Edition: 1.0

Series_Information:

Series_Name: Master's Thesis

Publication_Information:

Publication_Place: Kingston, RI

Publisher: University of Rhode Island

Type_of_Source_Media: paper

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1965

Source_Currentness_Reference: publication date

Process_Step:

Process_Description:

The data were obtained from the National Geophysical Data Center and imported from an ASCII text file to an ArcView table. The table was later converted to an event theme in ArcView and saved as the final shapefile.

Source_Used_Citation_Abbreviation: schwartz65.txt

Process_Date: 20020912

Source_Produced_Citation_Abbreviation: schwartz65.shp

Source_Produced_Citation_Abbreviation: schwartz65.dbf

Source_Produced_Citation_Abbreviation: schwartz65.shx

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Lawrence J. Poppe

Contact_Organization: U.S. Geological Survey

Contact_Position: Geologist

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Road

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543-1598

Country: USA

Contact_Voice_Telephone: 508-548-8700 x2314

Contact_Facsimile_Telephone: 508-457-2310

Contact_Electronic_Mail_Address: lpoppe@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Entity point

Point_and_Vector_Object_Count: 50

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.001

Longitude_Resolution: 0.001

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1927

Ellipsoid_Name: Clarke 1866

Semi-major_Axis: 6378206.400000

Denominator_of_Flattening_Ratio: 294.978698

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: schwartz65.dbf

Entity_Type_Definition: Shapefile Attribute Table

Entity_Type_Definition_Source: ESRI

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: CONSECNO

Attribute_Definition: Sequential number assigned to a data record

Attribute_Definition_Source: Compiler

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1

Range_Domain_Maximum: 50

Attribute_Units_of_Measure: station

Attribute_Measurement_Resolution: 1

Attribute:

Attribute_Label: PROJECTID

Attribute_Definition: Name assigned to the data set for future identification

Attribute_Definition_Source: Compiler

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: SCHWARTZ65

Enumerated_Domain_Value_Definition: Scientist and publication year

Enumerated_Domain_Value_Definition_Source: Compiler

Attribute:

Attribute_Label: CRUISEID

Attribute_Definition: Cruise identifier

Attribute_Definition_Source: Scientist

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: TR-018

Enumerated_Domain_Value_Definition: Abbreviated name of ship (Trident) and cruise number

Although this data set has been used by the U.S. Geological Survey, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials.

The user must have a computer system with a CD-ROM available. To browse the information contained on this CD-ROM, the user must have a current WWW browser available. The user must also have software installed on their computer to unzip the archived file.

Fees: None

Technical_Prerequisites:

The data is available in ArcView shapefile format. The user must have ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView, the user may utilize another GIS application package capable of importing data.